Fatal error: Uncaught Error: Class "Drupal\Core\Database\Schema" not found in /home/qcsvlel/www/core/tests/Drupal/Tests/Core/Database/Stub/StubSchema.php:14 Stack trace: #0 {main} thrown in /home/qcsvlel/www/core/tests/Drupal/Tests/Core/Database/Stub/StubSchema.php on line 14